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Protocol Definition between Ground Stations and Command RX
==========================================================
Introduction
------------
using DTMF on FM
receiver should be activated for min. 200ms every 5s to listen for new commands
signs get scrambled using a secret Code Table
every command must be aknowledge by a beacon with the unscrambled code
Frame
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#42<code><cs>
Checksum:
---------
Xor over Signs intrepreted as HEX (0-9A-D#*)
Codes:
------
0 .. shut up (rfkill)
1 .. unshut up (no rfkill)
8 .. activate payload reciever
C .. cancel all commands
# .. reset
* .. safe mode
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